Glazings with granular aerogel

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:194869

Dengler, J J; Wittwer, V ^[1]

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1. Fraunhofer-Inst. fuer Solare Energiesysteme, Freiburg (Germany)

Double glazing units filled with granular aerogel open up new applications in the fields of daylighting systems and passive solar architecture. Silica aerogel has ideal characteristics for solar thermal applications. High transparency for solar radiation is combined with extremely low thermal conductivity. The chemical company BASF (D) is developing a granular form of aerogel, which will be introduced to the market in the near future. The application potential of this material in window systems was tested as part of a CEC-JOULE project in co-operation with four other industrial companies and two research institutes under the leadership of the Fraunhofer-Institut fuer Solare Energiesysteme (FhG-ISE) in Freiburg. A typical u-value for a double glazed window with a 16 mm thick layer of granular aerogel is 1.0 W m{sup {minus}2} K{sup {minus}1}, the solar transmission for diffuse light is about 45%. Both parameters are variable over a wide range depending on the particle size distribution, thickness of the layer and choice of the filling gas. First window elements were tested in different applications. Realized installations are presented.

• OSTI ID: 194869
• Report Number(s): CONF-9404167--; ISBN 0-8194-1564-2
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
BUILDINGS
DAYLIGHTING
DEMONSTRATION PROGRAMS
DOUBLE GLAZING
FOAMS
GRANULAR MATERIALS
OPTICAL PROPERTIES
PERFORMANCE
THERMODYNAMIC PROPERTIES
WINDOWS